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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd18e9908cc187bdbea1a59517cab6bfa978894c8c208b34ea4946f55e214fd' 
  AND token = 'pcc6gSQ4KpyS+tn+uMU+DdvEJ6VWHz5pnw9+Vw2AOKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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