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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd2e87af46ab674093bc843a0ac2670c8e5a98d633e1deee2e6e86981aa4b9a' 
  AND token = '9X5lXebCBVUQkvvPwrwb+mBosJYPjWrQyProzilAVQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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