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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c2b8aa53683acc6c44e7c47be3a226025799694db48016d69d46d911a23f6f' 
  AND token = 'n0XbT18iS+f/1fNzqeMMkiw6J0raGO29CPlefydF2YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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