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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9caef8cff0b081ba35922a5640c4730f6f5b062fe2f0ab5493c9549c4a68d2' 
  AND token = 'plHAP57LbdgWC1wvyV7mFX72H0HnIHOBas2bGx/Bfbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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