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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf784a8f592026448b12057cbcb8c0595a3f79c89b0dcb45c7cd11dca1fbd74' 
  AND token = 'Y1yDwSp7ontGRa5ItPJqcxF/OiBh9E5t71PtiwuwbdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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