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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2954c63498624f2fd1ee1400efa9055d6e84699aa67b26b440b4bac4f011e03' 
  AND token = 'vai8GI27PJ9lL5YxiIg0vLw2qvD29C/XuTlXysmi4no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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