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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c6e142e40c154d4c69c3591f9f0d7d28d0163862ce171278dde7a2c2a4ee25' 
  AND token = 'cOg0clw0YX1KQOFgSrX7WDiuJ8sZDOkJ3xc1OhGOuRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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