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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fb80fd99dd7914b98dc696b7390797d4517fb662ac9009159a0de1885eee22' 
  AND token = 'Uq2fikE9cKL6GgeQQIf5RAESfzkzD4BMSmWZ6rPX6HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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