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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0adab607e3b56a4e13e91c0e39361f63cfdf97776bf0b80d39ea7fa27986b10e' 
  AND token = 'Z/xYtgwrcxnzRHvP8+T1qZOifIG2xCOOsPNbIALVzXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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