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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8014e28e654d3a7a17093a840a184c56bc4d3f2a710df666ce34263b718021d8' 
  AND token = '0rLUPxZmU1PF2jB4WpF5UIP4aJ5sCi1xQKX38IEQnJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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