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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88be60078f9354e3b544c4251282b717962afe826ee9c9ab5a4df6a4f4de5a38' 
  AND token = 'z7iHTNaa2sEaG1/TMfdEaItnFznIe7MNRfzSaj0SZt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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