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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2f97ef113391119e095aa1e7ac0e2d5667a67154ae774610e1ede4ff5223c8' 
  AND token = 'GdnITiMQ7lrsqnR+CahtLtXSoWEdgUTSNts1uCa5zIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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