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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08381b46b3e98cc87cbb6513957c6b759510e48a17d1b71b50a9e12b876ecacd' 
  AND token = 'v8VGakzSYwPFheRfql4ExHfglmNcaSVs/vlQFcvUyn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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