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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b117aa125ebeff32ebc1c93771fff7ba6f5d7b9ad4bd5dd5fa87ec4c5504afc8' 
  AND token = 'T6rwTqdxi1G05lR6CZmVYYAxUabMjPnX1penBH7lPc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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