SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54cde2a2c02a5c4bb75d6807e220fa3337fd55246a51c34d8ea93dfc54099d16' 
  AND token = 'GYAFSNs44/Xt8L6BehJqCEtgsYjCpC50uhoZh86yKoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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