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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23d11a98f205de462fa6a690d921c9f2f12e41bdee442d1de55ab06b0b96ab6' 
  AND token = 'bZcun+aPQDiuT1IU1kd9R2TJAUM90GvcETALINy/rqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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