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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ccf0be5786211da7cae03163f3385b408e7fd1d8239e5d8e8082e02c393e1c' 
  AND token = 'vKqzvkEmxtTo8iS8ypPajmuIcttNyV5QCFF1OHYa4hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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