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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4383d3aff39b04d565e3bb1adf9a3a1dc4f0c76af941957544d5eea890dbcd' 
  AND token = 'w7hsJbZD1yI19ZyqCjetTk1lxTTIP1S0yY525e+SW7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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