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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3122554fbceb3a5a68cfd45c846e5bf0aa0078cb342b0ed656deb60e3b94acb9' 
  AND token = 'UBmqDojOIbHU/3bgKEJDd2PU08SKnv9e7jvS+zo3XLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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