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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffea20473379c739a3d37ba56261f9a97fc29375f93892f9b0c4859b5594718' 
  AND token = 'wltGP0V5jYQ8ghJO3k7O6f1L6K3fhZnk0PogI3Eefcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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