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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0684c874dd28d0550d7498d04f6c92f3bc7a973b8a468a7d269926aee2590d5e' 
  AND token = 'yYyisLa7QSWX/BYqM1mBY4qdsmdR1ZuVCQIxLmsCUNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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