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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0c636af0e96600b429232e098f5f43b93d735cdc11ac27d44adf824d0e0f1e' 
  AND token = 'tROFXTiWuLZaRZMK14tb0gFvVCY5MDIO/bi3X2xPbe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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