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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ff62025b78a3c991d3a0a68867c19d4202a93a62facd4cbcfed4504c2ae75c' 
  AND token = 'a45eOL1+/zojmpJT6XcumE2M48dKsZj6ke7Inwdxan4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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