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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8157c7a72712a34f8a2d84c0ba579555af9733dddfee2e6faf675c37261604' 
  AND token = 'fWAnx+yLMwkylyX2BXrtJtvL1B0XT4Vojn41Y/yQngM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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