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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02e0b697217d7d11c06102a31d91d2daf9d55a0f0bd3224b86d53ff27d378cc' 
  AND token = 'zN9+yKldcIgIysBfHweSCVyKrg0RugE5WrASfH9pTuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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