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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebf3473a63a0e0bb4f9a6e4ab47c67e71aab3eca6ae99edffd3b69fc2cdde30' 
  AND token = 'NQ/nwH72IdImgCzL03b6WTmpRTEc73tadqBsJ0F2ADs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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