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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc92a2530435c4b8ef4204aa3d00f95488966217f31ae4618e6a90ee0a0dc40' 
  AND token = '6HVHpvhpMDtNbWxSq0DxsT6LTTb4uL0XmHBvTnMC/3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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