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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4084001529c6c983d3c1d235cd4d7b01bd3e3f0bae55b80c9bf75a7384a0e99c' 
  AND token = 'mDSej7RWsndyX4QBTXzRLaApaSi0P+RtcXJm5oTkO2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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