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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a7457cad0aeecaedd529bbbf61f6f58d1168900cda30cc00f52c43581c0668' 
  AND token = 'd9Acyf3/rEEByPvab3J1wj1fwSCa4TA2TJ2TyBPL+2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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