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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb32fca25e66c0dbcfb39291704c039a82d51b2f249af4025d155196da7e606d' 
  AND token = 'nXsYdoinyqQtt5YIkTHJgIaMgzfsudLx8gzTlc+Xdgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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