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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2673cecb588d6618c4fd8f286d6c4b7ab124150197b37071c3e0c1d0207f202b' 
  AND token = 'Hz6CxcQ4yHItdIjonUASOVRiQxw713rW1LlKR0gmNvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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