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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd671285700ae59a60730def4dafbffa0f2ad35bade2ca779b93d631bfc463fa8' 
  AND token = '7V9VypZyaU0pWy0irec6r9n+pViM/B83TPHzieqvceo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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