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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b2675f82107dff4597cb43b8bda628e6dc07f04b4df2f6a5cc3459efe2a3ae' 
  AND token = 'BKqjmjIFoVIBam+Dg28E67k+Ema7cYyZgr776udHT6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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