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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb55bcf6c72b39f70442772e814eb7379fe2f3aed0f3af8816fa6732865db4d' 
  AND token = 'YEqsHdpSNC2wlTbf1+wwXV0a4qqJFU6fkd1N7mQIouE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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