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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06b2719dc7c060e489123909c6fe13aac00b99e8ac4fdbad892d7545ae86834' 
  AND token = '7NoJ+1dNU//UXyRjshP84ppcu5OkOPFCyIZEPa5yp4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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