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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f11586e008f9ab08ccc9f8e41a2e6cf70992afd193db98a19cd269a9b7b505d' 
  AND token = '2dIcFngawhRIAy7tlHPKLzrGvsJtRmMZiJ/YuMChIbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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