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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3eb70e96b5a36c56e0a2d32029c067b4e3ee1e0dec2f5cd83831b9a0f909ebb' 
  AND token = 'd8e9wJCdjyrBrZWxIS9rxayWNsx4of1632X9pb+l694=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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