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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75689d23765898989e8a1ea5d865bdc1180590e9755bf3a03c99a351c6ebe23c' 
  AND token = '5qpjUbqv/02CN6x+UY/lo/ej3bkz3c8OYeR+UJNb8PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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