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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91dd0f01f9353e209c6bd5dc139e50f9159cab5a93bc20031778b463ae2d813c' 
  AND token = 'mOwy3M7Lfr2hiLoX7KXCvsLeVxiImGHjGZ9wIkDtm4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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