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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ad139627327c47a08f290cbc2c12a954f8211712482998dcf1dc05236ebae0' 
  AND token = 'wSO5FSa9qMTzQ3Ugf7cm27keHWihgRI+G4U12effBGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}