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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c89b8a8ec42d4afe866fb5ff26753cbc8e58df7134d0c864e9ed17689b0d33f' 
  AND token = '779iFEzB3hZht8Ue0mEmBmUv6STN4VUfh6c4paK3RLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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