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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd01d86a4713d8074552be30a5e13633d9edb4459e36e4b1f1b4e7091a53032' 
  AND token = '52BXlFdTUyhIUfSm7vAQB8hx9BgS63BonbYb0LYGCY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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