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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5384c5b84b29301c39c9a181ff20c92d82c9c8ff4ae86eca324b05780dfc96' 
  AND token = 'Hyn4DiJzcuG+vwiz5frXDHCe0MncD+VrzGNKboN7VAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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