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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7348dc33b2a9da3358590ba1778511bc84dfb1d330943630122fbe792fd423' 
  AND token = '+Rlpm4I+oENzbZ+FPQmeDAo/xoHbq4cECs7Fuh87ClI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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