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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807d08e279bc7ffb3f18e4b3eeee5c957b4d3d9ff706ac509344fe5786c42e6f' 
  AND token = 'kDj916bQmGa6Xu9ZBCUV2huyQLRvu45e9a4hmYqS8hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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