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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d9c948af4c4612a20e50296ebfa608f6ba8f41fcc8fe60140b79f126df2d61' 
  AND token = 'Dw1NVGDvJnmFNNROTaSy/9ec/wtw05QIifL5mIEEEUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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