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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5331b1b6b2062effb5441d432be50a2f824a3588c79f30374bcf7a489d1628' 
  AND token = 'Rbc4OQDT7mZHMTQ7+pECbJ6ixGIA0uDqUsTiURp7WWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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