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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d2ebd67d08ec90c578b52643fd8c7f8a4fe297c62c5791e9ac54e97328dce3' 
  AND token = '9dM/AR0zIh7F9EplKxbBIWEcRQpVsIuluNNxxQ7visg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00593

JSON explain

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