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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f055c18db149b44de9932f90b345e26de089c1269d6439c1df2bfa2402eb59' 
  AND token = 'KuAMJ/7CqLi9X5/824xomEjY8lySS1kpi5/MdlgyxHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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