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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cda0e21765c4b49ecbc31a37d8db31d9f507ca278da6044a39a3bbc5cdd4289' 
  AND token = 'aFcdwRREyZXb1Kv5vExJpp4kdSfmYLtywefMzFMHODE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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