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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a773140c487028245a770ff120d9aa77c1b41ed0c963a742a85d2f8b9fea2e60' 
  AND token = '/fZmcI7X+/RH5atHPji8pdMIVJMztNVKt5irnRMKumc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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