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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5a3dcb540a274704d5213d9753cf1a25e056a23eeb5b7cdc84bdc5f67e39c6' 
  AND token = '6cwhlNqxyk0qN3A+daidZV4xGqMwWfhYTGbTWFsG1LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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