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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae2cc1ee33c6816b196d684dab4d8ddf21d04ffe7a17f4e3b51a52f183b0195' 
  AND token = '6Pq4e/YjRfv3LBjFIanMV9Bk6fHVLeLMXsuHa2wbxZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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