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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8728ae035db647aae31947076632403a3f1d4700b912d69a1d36a5a4cf30fd9d' 
  AND token = '4BfDcefUdo1U4IL6OV0x1jzibMwRnh2Hn+br5mHTtAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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