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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ed8122655e142a75cb90ff49c3010475d0a961d6a2958994a33724a48bb477' 
  AND token = 'qysOofO2kHRHWHKm3aPD4dvD2VbTy1ZlceQKfRu7sXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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