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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223eb2b527af4428c7afebca6008730de1b3512a890f383e2db2beccb89a3634' 
  AND token = 'PLWtYX8HtzbrCqnbxMw8yOQQFBbIJaWUHqB+xXTeIo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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