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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5c77dc39bfe69edcb42b3f3a3c31357367a006bf2582be481e42a6162ebdcd' 
  AND token = 'lRuuq6GBu6xkZsNIKVSVcd6oOsEzTnBCpO6B9fUhrbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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