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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8cad15a3bc02fc3c4fb1c48ac36f49245e0ebdef58c150db7ef1a84950d4bf' 
  AND token = 'fPI/Z70IuoDBOR9WLJKw69KH1eZzT4myLHb7tajLqts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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