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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff762685b5928e76a9735f8d45a93c93cd7a430785880501d3f064336c5cd8e' 
  AND token = '8fLe0aa95u0KrlRwAs353XYjjziYz5mIf+0E4Jt+Wmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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