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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7c88d79fd7ee5cacf2b799875035054f95d60c5d6883de56043dd62118ce34' 
  AND token = 'YNKjAaP3nL144IrZ2M/QIxadgAO5VFIC9K0YDcSzdeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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