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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2496e7a17e282606f540eb2c492f370a877d6632828e8220b9dd9c9c6af500d0' 
  AND token = '+cfl4Z9zDC7dcVlO94d0EYJpgu4Dg2N4DySJsdZ87qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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